Table of Contents
Advertisement
8.2.7
Standby master function
This function enables the data link to continue working by switching the control to the standby master station (meaning
a backup station for the master station) if a system down occurs in the master station due to a malfunction in the
programmable controller CPU or power supply.
The master station can return to normal and to system operation as the standby master station, even during data-link
control by the standby master station, thus preparing itself for a standby master station system down (master station
duplex function).
(1) Types of the standby master function
The standby master function can be categorized into three types as listed below.
Function
Master station switching function
Master station duplex function
Data link start function using a
*2
standby master station
*1
A standby master station does not start data link until the master station starts up.
*2
Configure the same system for the master station and standby master station (same modules connected, parameters,
and program).
140
When the master station goes
down, the standby master
station operates as a master
station to continue data link.
When a failed master station
becomes normal again, it
return as a standby master
station.
When only a standby master
station is started up, it starts
data link as a master station.
*1
*1
: Enabled, : Disabled
Advertisement
Table of Contents
Troubleshooting
